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#!/usr/bin/env python
#
# Copyright 2005 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
"""
Demod FM signal in data collected for radar.
Input samples are complex baseband, 250kS/sec.
"""
from gnuradio import gr, gru, blks, eng_notation
from gnuradio import audio
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import sys
import math
class my_graph(gr.flow_graph):
def __init__(self, input_filename, repeat):
gr.flow_graph.__init__(self)
baseband_rate = 250e3
audio_decim = 8
audio_rate = int(baseband_rate // audio_decim) # output is at 31250 S/s
src = gr.file_source(gr.sizeof_gr_complex, input_filename, repeat)
guts = blks.wfm_rcv(self, baseband_rate, audio_decim)
sink = audio.sink(audio_rate, "plughw:0,0")
self.connect(src, guts, sink)
def main ():
usage = "usage: %prog [options] filename"
parser = OptionParser (option_class=eng_option, usage=usage)
parser.add_option ("-r", "--repeat", action="store_true", default=False)
(options, args) = parser.parse_args ()
if len (args) != 1:
parser.print_help ()
sys.exit (1)
try:
my_graph(args[0], options.repeat).run()
except KeyboardInterrupt:
pass
if __name__ == '__main__':
main ()
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